Different nations handle tariff barriers differently. A country may have a single tariff system for all goods from all sources. This is called a uni-linear or single-column tariff. Another type of tariff is the general-conventional tariff. This tariff applies to all nations except those that have tariff treaties (or a convention to that effect) with a particular country. A tariff may be worked out on the basis of a tax permit, called specific duty, or as percentage of the value of the item, which is referred to as ad velorem duty. Sometimes both specific and ad valorem duty may be levied may be levied on the same item as a combined duty.

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